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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 111 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.59² =
  2. 2.53² =
  3. 3.85² =
  4. 4.44² =
  5. 5.48² =
  6. 6.43² =
  7. 7.39² =
  8. 8.63² =
  9. 9.51² =
  10. 10.82² =
  11. 11.64² =
  12. 12.96² =
  13. 13.34² =
  14. 14.38² =
  15. 15.98² =
  16. 16.65² =
  17. 17.79² =
  18. 18.41² =
  19. 19.89² =
  20. 20.56² =
  21. 21.54² =
  22. 22.99² =
  23. 23.76² =
  24. 24.87² =
  25. 25.31² =
  26. 26.88² =
  27. 27.72² =
  28. 28.62² =
  29. 29.45² =
  30. 30.94² =
  31. 31.74² =
  32. 32.97² =
  33. 33.58² =
  34. 34.61² =
  35. 35.68² =
  36. 36.36² =
  37. 37.32² =
  38. 38.95² =
  39. 39.69² =
  40. 40.86² =

Answer key

  1. 3481
  2. 2809
  3. 7225
  4. 1936
  5. 2304
  6. 1849
  7. 1521
  8. 3969
  9. 2601
  10. 6724
  11. 4096
  12. 9216
  13. 1156
  14. 1444
  15. 9604
  16. 4225
  17. 6241
  18. 1681
  19. 7921
  20. 3136
  21. 2916
  22. 9801
  23. 5776
  24. 7569
  25. 961
  26. 7744
  27. 5184
  28. 3844
  29. 2025
  30. 8836
  31. 5476
  32. 9409
  33. 3364
  34. 3721
  35. 4624
  36. 1296
  37. 1024
  38. 9025
  39. 4761
  40. 7396

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